Pl. addenda. [a. L. addendum something to be added, gerundive of add-ĕre to ADD. The pl. was in earlier use than the singular; cf. miscellanea, minutiæ, etc.] A thing to be added; an appendix or addition.
1794. Burns, Wks., IV. 179. You cannot, in my opinion, dispense with a bass to your addenda airs.
1830. Miss Mitford, Our Village, IV. (1863), 260. The addenda of the work.
1879. O. W. Holmes, Motley, xxi. 179. After I had gone over the instructions for the last time I wrote an addendum.
1879. Daily News, 16 April, 3/6. The mover of the resolution accepted as an addendum thereto the further expression of opinion that, etc.